If you strongly suspect foul play in a tournament, you can approach the director after the event and present your evidence. Make sure you understand, however, that accusations and mere suggestions are an extremely serious business. Never accuse someone outright at the table of cheating. Doing so is considered one of the worst possible offenses in bridge. Even to simply imply someone is cheating is to start a heavy ball rolling that won't stop until you or the accused suffers profound embarrassment.
And remember: there is a big difference between those who are deliberately cheating to win an event, and those who don't know any better than to psych once too often or to hesitate at the wrong time. Both types of players should be reprimanded, but the difference in the weight of the accusations and the severity of the punishments is huge.
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